A 35-year-old male with known COPD presents with acute dyspnea and chest pain. CXR shows a right-sided pneumothorax measuring 4 cm (lung edge to chest wall) with mild mediastinal shift toward the left. Oxygen saturation is 88% on room air, heart rate 110/min, and blood pressure 128/82 mmHg. What is the most appropriate immediate management?

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